Carburetor



NOV. 25, 1930. B F. GRAVELY4 l 1,782,848,

Y CARB'URETOR I Filed Jan. 18, 1930 Patented Nom'zs, 1980` f BENJAMN r. GRAVELY, or numana, wnsrVIRGINIAY Y cARBURn'ToR `Y Aliplication mea January 18, 1980, seriai No. 421,851.

\ raise and lower the needle valve, such means being regulatable to increase or decrease the said movement.`

A further object is to` provide a throttle valve which is so constructed that it automatically seats itself, whereby to properly compensate for wear of the valve and seat, l and thereby provideanon-leaking it between l the valve andseat. p

Other objects and advantages will be apparent from the following description when taken in connection with the accompanying drawing; Y

In the drawing: Figure 1 is a vertical sectional view through i a vcarburetor made in accordance with the present invention, the interior parts being in elevation. v

Figure 2 is a vertical sectional view, similar to Figurel, but showing the interior parts in section.

y Figure 3 is a vertical sectional view on the line 3--3 or Figure 1. L y

vleferring Vparticularly to the accompanyl., ing` drawing, there is shown a cruciform member which includes the central vertical portion 10, from the` opposite sides of which` extend the branches l1 and 12, the former' being formed for connection with anl intake manifold, while the latter is adapted to re,

ceive atmospheric air.` The lowerend of the vertical portion is formed with a bottom wall 13, through thercenter of which yisdisposed the vertical stemk 14, having the longitudinal bore `15, a portion of said stem extending above the wall, `within the said member, whilethe lower portion extends below` the wall and is externally threaded to receive. thereon `the vertical cylindrical member 16.` This member 16 hasa head: on its lower end,

and is disposed upwardly through the cup or gasolinefloat chamber 17, whereby to secure-V. ly hold said chamber `in` position. i Inone' side of the member `16 is an opening 18, through which gasoline enters, from the said chamber, such gasoline beingdrawn upwardly throughthe` b thence into the mixing chamber 19.

`Rotatable within the mixing chamber 19` is the cylindrical valvebody 20, the same being hollowI and open at its lower end to'` receive the upper end portion of the stem`14l The side, as shown at 21,-the upper portion of said body being solid, as indicated by the numeral V22.` At diametrically opposite pointsin the wall of the throttle valve body 2O are the ports 20', which are adapted to register with the branches 11 and 12, to permit passage ot atmospheric air` from the branch 12 `to pass over the gasoline et l5', to become carbureted i and flow to the engine through the'branch 11. Formed circumferentially inthe outer face ofV this solid portionis a groove 23,0and` formed in said portion, above'and below the groove, respectivelyyare thecuts 24; and 25, both of which extend circumferentially for a distance N UNITED-STATES YPArialar'o1-FME f ore 15, totheijet 15?, and

valvebody 20 islongitudinally split, on one Y slightly greaterthan one-third ofthe `circum` ference^ thereof. Corresponding,` `A ends of these `cutsliein the longitudinal split of the valve body, as clearlywseenin thedrawing. Threaded downwardlyV through "the upper end ofthe valve body is a. screw 26, the lower .end of which `bears on the upper face ofthe` free end of theflex-ible groove carrying portion 27, which is partially separated from` said body by the cuts 24 andv25, andthespl'it 21,1such screw when rotated forwardly,`bei`ng adapted to lex`s11clrportion inwardly for the purpose of disposing the free end thereof out of alinement with the adjacent end of the groove at the other side of the split, with the result that such flexible portion is in the position and form of a cam." Upon rotation of the screw 26, in a retrograde direction, the natural, inherent -flexibilityv ofsaid" portion 27 will cause said port-ion to spring outwardly toward its normal position. Thus the portion 27 is adjustable to vary the inclination of the groove 23, and thereby the 1longitudinal movement of the throttle valve body 20. Threaded into one side of the vertical member 10 is a screw 28, the inner end of which is disposed within the groove 23, whereby when the valve body is rotated said screw will cause the said body to move vertically within the mixing chamber, when said screw end engages within the portion of the groove in the flexible portion 27. Threaded downwardly through the center of the valve body is the needle valve Q9, the lower end of which lies within the upper end of. the bore 15, of the stem 14. The upper end of the needle valve is provided with a fingerpiece 30, by means of which the valve may be rotated for vertical adjustment, said lingerpiece having a flexible pawl portion 31 which engages with the circular toothed member 32, whereby said needle valve may be held at any point in its adjustment.

From the foregoing it will be seen that, upon rotation of the needle valve such valve will be moved upwardly or downwardly, within the upper end of the bore 15, whereby to regulate the flow of gasoline flowing from said end oi' the bore. As the air is drawn through the valve 20, such air passes over the upper end of the stem 14, and draws thereinto, and mixes therewith, a portion of the gasoline in the upper end of the bore 15. This mixture is drawn into the engine, through the intake manifold, not shown, but which will be understood.

The upper end of the valve Q0 is provided with a laterally extending arm 33, which is adapted to be connected with a suitable control device. As the valve is rotated, the same is moved longitudinally within the miX- ing Chamber, so that the needle valve will be raised or lowered within the bore 15, thereby maintaining the same proportion of gasoline drawn from the said bore, to the amount of air drawn through the valve. Thus, as the valve 20 is rotated to decrease the amount of air passing through the branches 11 and 12, the needle valve will move down into the bore 15, whereby to decrease the amount of gasoline, in the same ratio to that of the reduction of the air, thereby maintaining the air and gasoline at the same proportions, during the acceleration or reduction of the flow of mixture to the engine. l

Attention is also called to the automatic seating of the valve in the chamber, duev to the split, thereby compensating for wear,

and insuring a tight fit.

lVhat is claimed is:

A carburetor including a casing, a nozzle for discharging gasoline into the casing, a rotatable throttle valve in the easing longitudinally split whereby to flex into contact with the walls of the casing, a portion of the valve being flexibly adjustable and peripherally grooved, means on the casing engaged in said groove whereby to cause longitudinal movement of the valve upon rotation thereof, and a needle valve carried by the throttle valve movable with the throttle valve into and out of said nozzle.

In testimony whereof, I aliix my signature.

BENJAMIN F. GRAVELY. 

